The further I searched, the more it seems to me that in developed countries (like US, Canada and the above examples), tap water is safe to drink directly. Is that true? Do you drink tap water without boiling?
Yes. It’s a bit of a scandal when that’s not true. (Canada here)
And to my surprise, I checked the Water Supplies Department website and notice it asserts that tap water in Hong Kong is potable, like many well-developed countries and regions.
Boiling it has to be “force of habit”, then. I wonder how long it’s been potable. I’m guessing mainland China is mostly boil-first.
Penguin_Rocket